The link supplied by kingfish gives a basic explanation of use for the 2 graphics chips. Do a web search if you want more in depth info.
Same for 'cpu cores', web search has many basic/in depth articles.
My PC- Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T.